I think your husband needs to tell her to fuck off. Or is that what you're suggesting: to text her from his phone? It wouldn't solve the problem, fun though it would be: that she thinks she's getting somewhere with your husband. Is he encouraging her? How long has it been going on? And why would she carry on if she wasn't getting some response?

Oh your poor husband what has he done to discourage this woman from sending him these unsolicited texts? Told her to stop? Said he'll report her at work for sexual harassment? Blocked her number? No? Thought not.

So hes deleting them, however he doesn't know you've seen them, but you seem to think he isnt responding? Where exactly are you seeing these backups as i use Whatsapp and have never seen conversations stored elsewhere once cleared from the stream? So how do you really know he isnt responding?If this woman was constantly sending messages and pictures of underwear etc which he was classing as harassment, surely he would be honest with you and tell her to stop. Why hide anything?Also i dont think whatsapp is to blame here (devils work?? ) that would be the two people using it to message inappropriately....

You can back up whatsapp messages- theres an option for it when you first sign up. As far as I know though you only see backed up messages when you activate whatsapp on another phone on that number though. And to do that DPs DH would get a text with an activation code..

Surely "this is very inappropriate. Please don't send me more messages like this. We are colleagues" would be appropriate. No dramatics, just make her feel like a fool by shutting this down calmly and firmly.

(But I have a good friend who was with an implicitly trustable family member when some unsolicited WhatsApp messages started to come in on a new iPhone from a member of his staff - one side of a conversation. I don't think he even used WhatsApp but there seemed to be some sort of connection with work email addresses.)

I would make a note of her number so i had it. Then tell DH ive seen the message and ask him honestly whats gong on and why he hasn't told her to stop as its inappropriate. his reaction should tell you all you need to know.if you still arent happy with it then text her and ask her same thing, see if their answers match?

i hope for your sake its nothing more then her trying it on and is one-sided.